多版本python pip報錯Fatal error in launcher: Unable to create process using解決

由於python即裝了python2後又裝了python3. 隔了一段時間，發現pip不合適了，pip install安裝提示Fatal error in launcher: Unable to create process using 切換到我們安裝python的script目錄，如cmd C:\Python27\Scripts，執行命令                             

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